CN106987686A - The process for quenching of steel member - Google Patents
The process for quenching of steel member Download PDFInfo
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- CN106987686A CN106987686A CN201710124648.3A CN201710124648A CN106987686A CN 106987686 A CN106987686 A CN 106987686A CN 201710124648 A CN201710124648 A CN 201710124648A CN 106987686 A CN106987686 A CN 106987686A
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- Prior art keywords
- steel member
- heating
- quenching
- covering
- cooling
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The present invention provides the process for quenching of steel member, and the heat treatment deformation that the process for quenching can shorten after the heat treatment cycle of a series of quenching process, and quenching is small.The process for quenching of the steel member is, after part or all of the surface of steel member before carrying out Quench heating with graphite covering, the such covering treatment of progress, in the heating furnace with heater, steel member after the covering treatment is heated to hardening heat, then cooled down.Preferably, the heating of from least a period of time to the heating process of above-mentioned hardening heat is carried out in vacuum or reduced atmosphere.Above-mentioned covering treatment can be carried out after anti-carburizer or anti-decarburizer are covered to the surface of steel member.
Description
It is July 24, Application No. 201310314249.5, entitled steel member in 2013 applying date that the application, which is,
Process for quenching divisional application.
Technical field
The present invention relates to a kind of process for quenching of steel member.
Background technology
Quenching Treatment is carried out to various steelworks and using mould, the instrument steel member as steel part of representative etc., is quenched
Fire processing is the processing that the steel member is heated to after the state of austenite structure, cooled down.Also, for heating steel member
To means during hardening heat, in the following manner is utilized：Atmosphere gas to imported into stove transmits heat as medium to steel member
Convective Heating；From various radiographic sources (heater) to steel member infrared radiation, pass through the infrared heating of electromagnetic wave heating
(patent document 1~4).
The situation of Convective Heating has advantages below：For example the efficiency of heating surface can be improved by pressured atmosphere gas, shorten and add
The time required to hot.On the other hand, according to the difference of the position in heating furnace, the pressure of the gas of convection current, direction are in steel member
Each position on surface is different, the situation for having generation non-uniform temperature (heating is uneven) at each position of steel member.Separately
Outside, according to the shape of steel member, have between its thick part and thin part and produce the uneven situation of heating.Also, work as
When the heating is uneven obvious, when quenching cooling, steel member can produce heat treatment deformation.
, can also be because can just be heated without importing gas into heating furnace in the case of infrared heating
(being included in the situation under reduced atmosphere) heats in vacuum, and such case is conducive to suppressing surface oxidation of steel member etc..
The Japanese Unexamined Patent Publication 2006-342377 publications of patent document 1
The Japanese Unexamined Patent Publication 10-080746 publications of patent document 2
The Japanese Unexamined Patent Publication 08-067909 publications of patent document 3
The Japanese Unexamined Patent Application 61-253320 publications of patent document 4
In the Quenching Treatment of steel member, method during heating is had many good qualities using infrared heating.But, even
The good infrared heating of the efficiency of heating surface is generally acknowledged to, in the case of heating steel member in the heating furnace with heater, is obtained
Less than the efficiency of heating surface that is consistent is functioned, firing rate is slow.Particularly, as the heater of radiographic source (one before heating
As be to before 600 DEG C or so), the infrared ray amount from ray source radiation is few, and the firing rate of this period is just slow.
In addition, in the case of infrared heating, because the infrared ray utilized has directionality, according in heating furnace
Position difference, the angle on the surface relative from radiographic source of steel member is different, therefore the energy that steel member absorbs is on surface
Different parts be different.Its result has and heating inequality is produced at each position of steel member as the situation of Convective Heating
Even situation.Also, when heating the steel member of the complicated shapes such as mould, sometimes because its shape causes the temperature of the part of thickness
Degree, the recess on surface temperature it is low and produce heating it is uneven.Cause to quench heat when cooling down as described above, the heating is uneven
Processing deformation.
In addition, in the Quenching Treatment of steel member, next the steel member for being heated to hardening heat is cooled.Also,
At this moment cooling means is unrelated with the species of above-mentioned heating means, generally, or the cooling gas brushed after pressurization is cold to implement
But, implement cooling or in immersion water, oil, various polymer, the quenching medium such as salt, or use flowing groove (Japanese：Flow Move grooves) come
Implement cooling.Wherein, using cooling gas method have improve speed effect, according to the cooling gas way of contact not
Together, there is the situation for producing cooling degree different (inhomogeneous cooling is even) at each position of steel member.Further, since in the thickness of steel member
Part, surface recess portions cooling velocity it is slow, therefore this is also the even main cause of inhomogeneous cooling.In this regard, even with
Can than relatively evenly the surface of steel member is cooled down immersion quenching medium method, the method using flowing groove, be also
Same.Also, when inhomogeneous cooling is even obvious, steel member after the cooling period produces big heat treatment deformation.
The content of the invention
It is an object of the invention to provide a kind of process for quenching of steel member, the process for quenching can shorten a series of quenching
Heat treatment cycle (the Japanese of process：ヒ ー ト サ イ ク ル Time Inter), and the heat treatment deformation after quenching is small.
The surface for being mostly used in the steel member of quenching machined etc. is finish-machined to the surface with metallic luster.
Therefore, the infrared radiation rate on surface is low, it is impossible to make full use of the effect of infrared heating.Accordingly, with respect to red for improving this
The method of UV radiation rate, the present inventor studies.As a result, have found most suitable for improving the infrared radiation
The method of rate, so that firing rate and cooling velocity when can not only improve quenching, and can also suppress by steel member
The above-mentioned heating caused by shape such as thick part, recess are uneven and inhomogeneous cooling it is even caused by heat treatment deformation so that real
The existing present invention.
It is, the present invention is a kind of process for quenching of steel member, it is characterised in that carry out Quench heating with graphite covering
After part or all of the surface of steel member before, the such covering treatment of progress, in the heating furnace with heater
It is interior, the steel member after the covering treatment is heated to hardening heat, then cooled down.And, it is preferred that to above-mentioned hardening heat
Heating process in the heating of at least a period of time carried out in vacuum or reduced atmosphere.
In the present invention, above-mentioned covering treatment can be after anti-carburizer or anti-decarburizer be covered to the surface of steel member
Carry out.
According to the present invention, by simple method, the heat time for being heated to hardening heat can be shortened.Further, it is possible to
Reduce the heating produced in steel member uneven.Also, in ensuing quenching cooling, also it can shorten cool time,
And also can to reduce inhomogeneous cooling even.So, as the heat treatment cycle that can shorten a series of quenching process and it can contract
The practical approach of heat treatment deformation after small quenching is useful.
Brief description of the drawings
Fig. 1 be represent in the process for quenching of example of the present invention and comparative example, the temperature of the central part of in-furnace temperature and steel member
Spend the figure of the change with the heat time in heating process.
Fig. 2 be represent in the process for quenching of example of the present invention and comparative example, the temperature of the central part of in-furnace temperature and steel member
Spend the figure of the change with the cool time in cooling procedure.
Embodiment
It is a feature of the present invention that the surface of the steel member before Quench heating is pre-processed by easy method, from
Even and if the infrared furnace of the prior arts such as resistance-heated furnace is not changed, can also make the steel member in heating process
Entirety is uniform and reaches hardening heat in short time.Also, by above-mentioned processing, in the mistake of the quenching cooling using various methods
Cheng Zhong, can make steel member overall uniform and cool down in a short time.Hereinafter, each technical characteristic of the present invention is illustrated.
(1) carry out covering treatment, i.e., carried out with graphite covering the surface of steel member before Quench heating a part or
All.
In the case of infrared heating, its efficiency of heating surface very big is influenceed by the surface state of heated object.Also,
When the infrared radiation rate on the surface of heated object is low, the relative infrared energy from ray source radiation, heating target
The little energy that thing is absorbed, it is long the time required to reaching heating-up temperature.So-called infrared radiation rate refers to, is can absorb from penetrating
" absolute black body " of whole infrared energies of ray radiation can evaluate " the heating of actual heated object as benchmark
The index of easness ", the infrared ray absorbing amount with absolute black body when being expressed as the infrared ray absorbing amount of absolute black body being set to 1
The ratio between (be less than 1).Then, if the product such as surface such as mould of steel member of quenching has metallic luster like that, at this moment
Infrared radiation rate be 0.05~0.3 or so, relatively low, the ultrared efficiency of heating surface is poor.Therefore, in practice, with metal
The Quench heating of the steel member of glossy surface is applied by importing the Convective Heating that atmosphere gas is carried out after pressurization.Also,
Also the effect of infrared heating is used together during the Convective Heating, but infrared heating now is a small amount of.
Therefore, present inventors studied the method for the infrared radiation rate on the surface for improving steel member.As a result find, if
The material of radiant heat can be absorbed in the surface covering of steel member, then can effectively improve the infrared radiation rate of the part.And
And, the material of radiant heat can be absorbed above-mentioned, graphite is the infrared radiation rate of itself very high material.So,
The inventors discovered that, if graphite is covered on the surface of steel member, even if it is a small amount of overlay capacity, it may have improve steel structure
The effect of the infrared radiation rate on the surface of part.Therefore, covering treatment is carried out in the present invention, i.e., carrying out quenching with graphite covering adds
Part or all of the surface of steel member before heat.
The infrared radiation rate on the surface of various components by the species for constituting the component material in itself except being influenceed it
Outside, also influenceed by its surface roughness.Also, in the case of steel member, its surface is general through various machines such as grinding, grindings
Tool is processed and is finish-machined to the metal glossy surface with various surface roughnesses.In the present invention, even in such feelings
Under condition, the steel member before Quench heating is carried out by using the graphite covering as the infrared radiation rate material higher than the surface
The surface with metallic luster, can so improve the infrared radiation rate on the surface of steel member.Also, from being used as radiographic source
Heater heating before can fully be shortened from heating initial stage (before ultrared amount of radiation fully increases) plus
The effect of hot time.
The above-mentioned covering treatment of the present invention can be carried out in the whole surface of steel member, only can also want to improve red
Position of UV radiation rate etc., as needed local progress.In general, the thick part of steel member, the recess portions on surface
Compared to for other positions heat when programming rate it is slow.If as a result, relative to the hardening heat of target, each position it
Between produce heating it is uneven, then this may also turn into quenching cooling when heat treatment deformation main cause.In addition, above-mentioned heating
When the slow position of programming rate cooling when cooling rate it is also slow.So, it is also even as generation inhomogeneous cooling when cooling down
Main cause, it is possible to encourage heat treatment deformation.In this case, by only entering to above-mentioned heating and the slow part of cooling
Row covering treatment, it is even to mitigate the uneven and inhomogeneous cooling of heating, by the heating of the entirety of steel member, is cooled to uniform temperature
Degree.
On the covering method of graphite, as long as can the surface adhesion graphite of steel member method, then do not limit it
Species.Also, it can also be coated with, spray the solvent containing graphite.At this moment the counnter attack of graphite system can be for example utilized in solvent
Penetrate agent, graphite base lubricant.In addition, the overlay capacity on graphite, as long as being reached in the surface portion covered with graphite desired
Infrared radiation rate (if for example, reaching described later more than 0.5 infrared radiation rate), do not limit overlay capacity.As above
Described, graphite is the infrared radiation rate of itself very high material, even therefore a small amount of overlay capacity be also improved it is red
The effect of UV radiation rate.Also, particularly in the present invention, there is the table of metallic luster in the steel member as quenching object
In the case of face, above-mentioned covering treatment can play effect.
Also, above-mentioned covering treatment is preferably, with infrared radiation rate of the surface portion covered with graphite at 200 DEG C
Graphite is covered for more than 0.5 mode.Sufficiently shorten heating on that can be obtained on the surface of the steel member covered with graphite
The value of infrared radiation rate during the effect of time, the present inventor also investigates.At this moment, the shortening effect of so-called heat time
Really, refer to fast as 1000 DEG C or so of firing rate of common hardening heat.So, the inventors discovered that, the effect
Degree can with heating steel member to 200 DEG C when the infrared radiation rate that measures be evaluated as index.Also, the knot of investigation
It is really：The inventors discovered that, for improving above-mentioned firing rate preferably when covering graphite to the surface of steel member, so that
The value of the infrared radiation rate of surface portion after the covering of steel member is carried out when being heated to 200 DEG C for more than 0.5 mode
Covering.More preferably, covered by the value of above-mentioned infrared radiation rate in the way of more than 0.6.
For the value of more than 0.5 above-mentioned infrared radiation rate, for example, can be by the way that there is metallic luster in steel member
Surface, graphite is covered to a certain degree of thickness in the uniform mode of no color spot (shade), to be adjusted.At this moment,
With the coating of the state of the solvent containing graphite, spray can effectively be reached for the graphite of covering it is above-mentioned equal without color spot (shade)
Even covering.
(2) steel member after above-mentioned covering treatment will have been carried out quenching temperature is heated in the heating furnace with heater
Degree.
The heating that above-mentioned steel member is heated to hardening heat in the present invention can be carried out according to usual way.At this moment
As long as the heating furnace used is common for Quench heating with the various heaters such as metallic heating body, silicon carbide heater
Heating furnace.Also, for example, during the effect of infrared heating (improve before) before heater heating, in order to
Efficiency of heating surface etc. is further ensured that, atmosphere gas etc. can also be imported into stove.In this case, in the heating to steel member
In, Convective Heating plays larger effect, and infrared heating is also acted.Then, if the present invention's is carried out on surface
The situation of the steel member of the covering treatment of covering graphite, then due to being opened when the temperature from the heater as radiographic source is low
Beginning just can be to greatest extent using the effect of infrared heating now, therefore, for a series of heat treatment needed for heat treatments
The shortening in cycle is favourable.
On the other hand, generally, in the heating of the steel member with metal glossy surface, in order to prevent surface from producing at this moment
Raw oxide skin, decarburization etc., the main flow of the heating are in a vacuum or carried out in reduced atmosphere.In this case, due to not having
Atmosphere gas is energetically imported into stove, the effect of infrared heating is only leaned in the heating of steel member.Then, if the present invention
Steel member, though only utilize infrared heating, also can high efficiency heating, therefore in heating furnace can for vacuum or decompression gas
Atmosphere, is conducive to preventing surface oxidation, the decarburization of the steel member in heating.Therefore, in the present case, preferably quenched to above-mentioned
The heating of at least a period of time in the heating process of fiery temperature is carried out in vacuum or reduced atmosphere.And, it is preferred that i.e.
Make as stated above etc., in the case where the initial stage of heating imports atmosphere gas into stove, the also (example after heater heating
Such as, in-furnace temperature is reached after 500~900 DEG C) vacuum or reduced atmosphere will be changed into stove.
(3) cooling has been heated to the steel member of above-mentioned hardening heat.
The suppression even to inhomogeneous cooling when quenching cooling of the process for quenching of the steel member of the present invention is also effective.Also
It is, surface easily heating and the easily cooling of the high object of infrared radiation rate.Then, if the present invention's is covered
The surface of the steel member of the covering treatment of graphite, then can cool rapidly when can be brought rapidly up and cool down when heating, therefore, it is possible to equal
The entirety of steel member is cooled down evenly.Also, the slow portion of cooling rate when the slow part of programming rate during heating is also cooling
Point (that is, the thick part of steel member, the recess portions on surface), therefore, in order to mitigate heating it is uneven and only above-mentioned
Part carried out the covering treatment of the present invention, as a result can also mitigate that inhomogeneous cooling is even, can equably cool down steel member
It is overall.Also, the result can suppress the heat treatment deformation that the steel member after cooling occurs.
(4) it is preferably that above-mentioned covering treatment is carried out after anti-carburizer or anti-decarburizer are covered on the surface of steel member.
It is for the covering treatment of the present invention, such as cold from being heated in the case of covering graphite on the surface of steel member
Carburizing may occur due to graphite for process but, the capped surface.Here, the steel structure before covering treatment is passed through
The surface covering anti-carburizer of part, being capable of pre- anti-carburizi ng.But, the surface of covering anti-carburizer is not limited to next to carry out this
The part of the covering treatment of invention, can also cover anti-carburizer on the surface for wanting pre- anti-carburizi ng.Can be with as anti-carburizer
Use various anti-carburizers used in conventional heat treatment or known.
If in addition, being oxidizing atmosphere in heating furnace, the surface of steel member may decarburization.At this moment, covering treatment it
It is effective that the surface of preceding steel member, which covers anti-decarburizer,.But, the surface for covering anti-decarburizer is not limited to next
The part of the covering treatment of the present invention is carried out, can also want to prevent the surface of decarburization to cover anti-decarburizer.It is used as anti-decarburizer
Various anti-decarburizers used in being heat-treated in the past or known can be used.
Embodiment
Prepare the 150mm of the SKD61 of JIS standards high temperature tool steel3Module component.Then, will by Milling Process
Its all face is processed into metallic luster, is used as the steel member for quenching.Next, one of surface to these steel members
Partly or entirely, the known laser for equably spraying the attritive powder containing graphite with the degree visually inspected less than color spot adds
Work antireflection agent (ProductName：Block ラ ッ ク ガ ー De ス プ レ ー [Off ァ イ Application ケ ミ カ Le ジ ャ パ Application Co., Ltd.]),
So as to be coated with, covering treatment has been carried out.Coverage condition as shown in table 1, there is following two conditions：Own to module component
Face is coated (No.1)；Leave two relative faces, remaining four sides central portion using it is round-shaped (radius as
75mm) it is coated (No.2).
Next, the above-mentioned surface for carrying out covering treatment to steel member and without carry out covering treatment and still with
Infrared radiation rate of the surface measurement of metallic luster at 200 DEG C.The surface to be measured is heated with electric heater first, is used
Contact tehermometer and radiation thermometer (ProductName：T425 (Detection wavelength scope 7.5um~13um) [Off リ ア ー シ ス テ system
ズ companies]) two kinds of thermometers measure surface temperature now.Then, the surface temperature to be measured in contact tehermometer
The temperature that radiation thermometer is represented when reaching 200 DEG C also adjusts the setting radiance of radiation thermometer for 200 DEG C of mode, now
Radiance be infrared radiation rate when the surface is 200 DEG C.Also, measurement as a result, steel member is covered
The infrared radiation rate on the surface of processing is 0.62, and the surface with metallic luster is 0.25.
Then, steel member No.1, No.2 of above-mentioned covering treatment will have been carried out and without the gold for carrying out any covering treatment
The steel member No.3 of category glossy surface is put into the heating furnace with heater together, carried out heating to hardening heat,
Cooling after heating.At this moment, steel member central part inserted with thermocouple, to be capable of the temperature in measuring center portion.Heating furnace
Furnace atmosphere, pressure can be adjusted, it may have the refrigerating function cooled down after the heating by brushing cooling gas.
The order of heating is to make to be vacuum for the time being in stove first, afterwards, imports nitrogen, is being forced into 200kPa nitrogen
In implement heating.Then, when in-furnace temperature reaches 800 DEG C, the in-furnace temperature is maintained for the time being, in the central part of steel member
Temperature stops importing nitrogen when reaching 800 DEG C.Then, make decompression in stove, implement and add under conditions of 70Pa or so is depressurized to
Heat, until making in-furnace temperature reach 1020 DEG C.The temperature of the at this moment central part of in-furnace temperature (furnace temperature) and steel member is represented in Fig. 1
Spend the change with the heat time.Then, reached in in-furnace temperature after 1020 DEG C, the temperature for measuring the central part of steel member reaches
To the time (time delay during heating) needed for 1010 DEG C.
Next, the order of cooling is, after the state that in-furnace temperature is maintained to 1020 DEG C, nitrogen is imported, it is right first
The complete cycle of steel member brushes the nitrogen 15 minutes for being forced into 200kPa.Then, and then, the pressure of rise nitrogen is to 400kPa
To be cooled down.Now the temperature of the central part of in-furnace temperature (furnace temperature) and steel member is as shown in Figure 2 with the change of cool time.
Then, the temperature for measuring the central part since cooling to steel member reaches time (half cooling time) needed for 520 DEG C, and
Measure cooling complete after steel member produce heat treatment deformation amount (ruler is put in steel member surface it is maximum right
Gap value between the surface for the steel member that can be measured when on linea angulata and ruler).
Table 1
Part or all of the surface of steel member has carried out No.1, No.2 of covering treatment and surface is not covered
The No.3 of processing is compared, and the infrared radiation rate for having carried out the part of covering treatment is high.Also, in heating, No.1, No.2's
Steel member starts to warm up speed soon (Fig. 1) from the initial stage of heating, and is considered as the slow central part of programming rate and reaches hardening heat
The required time substantially reduces than No.3.In addition, in cooling, generally requiring the cool time of the high-temperature area rapidly cooled down
Also shorten.Also, in No.1, No.2, the whole surface of steel member has all carried out the No.1 of covering treatment to heat treatment week
The shortening of phase especially has effect.Also, in No.1, No.2 steel member, the heat treatment deformation amount after it is cooled down also suppresses
Obtain smaller, be improved compared with No.3.
In addition, all having carried out the No.1 of covering treatment to whole surface and (having left relative two to the part on surface
Face and the central portion in remaining four sides is coated with toroidal (radius 75mm)) carried out the No.2 of covering treatment
Compare, No.2 can suppress heat treatment deformation amount smaller.When block steel member, during the heating in corner
Programming rate (cooling rate during cooling) than other parts heating when programming rate (cooling rate during cooling) it is fast.Cause
This, avoids the corner, and the slow part of the programming rate (cooling rate during cooling) during to heating carries out covering treatment, Neng Goujin
One step suppress due to steel member local heating when programming rate (cooling rate during cooling) difference caused by heat at
Reason deformation.
Claims (4)
1. a kind of process for quenching of steel member, it is characterised in that
The steel member is mould,
Part or all of the surface of steel member before carrying out Quench heating with graphite covering, carries out such covering treatment
Afterwards, the entirety of the steel member after the covering treatment is put into the heating furnace with heater and is heated to hardening heat,
In the heating process to above-mentioned hardening heat, reached in in-furnace temperature after 500~900 DEG C, in vacuum or reduced atmosphere
Heated, and cooled down after the heating in heating furnace.
2. the process for quenching of steel member according to claim 1, it is characterised in that
Atmosphere gas is imported into heating furnace initial stage in heating.
3. the process for quenching of steel member according to claim 1, it is characterised in that
Cooled down by being blown into cooling gas into heating furnace.
4. the process for quenching of steel member according to claim 1, it is characterised in that
Above-mentioned covering treatment is carried out after anti-carburizer or anti-decarburizer are covered to the surface of steel member.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-163185 | 2012-07-24 | ||
| JP2012163185 | 2012-07-24 | ||
| CN201310314249.5A CN103572018A (en) | 2012-07-24 | 2013-07-24 | Quenching method of steel member |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310314249.5A Division CN103572018A (en) | 2012-07-24 | 2013-07-24 | Quenching method of steel member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106987686A true CN106987686A (en) | 2017-07-28 |
| CN106987686B CN106987686B (en) | 2019-07-09 |
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ID=50044726
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310314249.5A Pending CN103572018A (en) | 2012-07-24 | 2013-07-24 | Quenching method of steel member |
| CN201710124648.3A Active CN106987686B (en) | 2012-07-24 | 2013-07-24 | The process for quenching of steel member |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310314249.5A Pending CN103572018A (en) | 2012-07-24 | 2013-07-24 | Quenching method of steel member |
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| Country | Link |
|---|---|
| JP (1) | JP6311955B2 (en) |
| CN (2) | CN103572018A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109517964A (en) * | 2018-12-28 | 2019-03-26 | 宁波合力模具科技股份有限公司 | A kind of mold vacuum heat treatment anti-deformation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6972640B2 (en) * | 2016-04-28 | 2021-11-24 | ウシオ電機株式会社 | Heat treatment method |
| JP6681797B2 (en) * | 2016-06-28 | 2020-04-15 | 住友金属鉱山株式会社 | Method of heating object to be treated, method of heat treatment of object to be treated, method of heat treatment of steel sheet, and heat-acceleration coating layer |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106987686B (en) | 2019-07-09 |
| CN103572018A (en) | 2014-02-12 |
| JP6311955B2 (en) | 2018-04-18 |
| JP2014040657A (en) | 2014-03-06 |
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